KR20150145614A - Composite using water treatment sludge and manufacturing method thereof - Google Patents
Composite using water treatment sludge and manufacturing method thereof Download PDFInfo
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- KR20150145614A KR20150145614A KR1020140075911A KR20140075911A KR20150145614A KR 20150145614 A KR20150145614 A KR 20150145614A KR 1020140075911 A KR1020140075911 A KR 1020140075911A KR 20140075911 A KR20140075911 A KR 20140075911A KR 20150145614 A KR20150145614 A KR 20150145614A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
Abstract
The present invention relates to a porous composition using purified water sludge and a method of producing the same, and more particularly, to a process for producing purified sludge powder by heat treating purified water sludge generated in the treatment process of tap water making tap water; Mixing the purified water sludge powder and water to form granules of a predetermined size; 10 to 40 parts by weight of at least one material selected from the group consisting of silica powder and zeolite powder per 100 parts by weight of purified water sludge powder, 100 parts by weight of purified water sludge powder, Mixing 70 to 130 parts by weight of clay to form a mixture; Forming a predetermined type of composition using the granules and the mixture; And a step of calcining the composition of a predetermined type.
Description
The present invention relates to a porous composition using purified water sludge and a method for producing the same, and more particularly, to a porous composition having a humidity control function using purified water sludge, which is a waste sludge generated in the treatment of a water treatment plant, .
If the humidity in the room is high, allergic diseases such as asthma and atopic dermatitis may increase due to the harmful fine powder due to the vigorous reproduction of mold or ticks. If the humidity is low, the viruses such as colds, A malfunction may occur.
For this reason, consumers are increasingly demanding to maintain a suitable humidity in the room, and a dehumidifier or a humidifier is used, but energy consumption is large and there is a problem that it is inefficient when used for a long time.
The present invention relates to a porous composition having a humidity control function using purified water sludge and a method for producing the same.
The present invention also relates to a porous composition having a humidity control function, which is manufactured in the form of a ball, and a method for producing the same.
The present invention relates to a process for producing purified water sludge powder by heat treating purified water sludge generated in the treatment process of a water treatment plant making tap water; Mixing the purified water sludge powder with water to form granules of a predetermined size; 10 to 40 parts by weight of at least one material selected from silica powder and zeolite powder per 100 parts by weight of the purified sludge powder, 100 to 30 parts by weight of the purified sludge powder, Mixing 70 to 130 parts by weight of clay with respect to the mixture to form a mixture; Forming a predetermined type of composition using the granules and the mixture; And firing the predetermined type of composition.
In this case, the composition of the predetermined type may be a ball-shaped composition, and the method may further include a step of allowing the glaze to be applied to the predetermined type of composition before the firing process, wherein the specific surface area of the composition of the predetermined type is from 30 to 95 %. ≪ / RTI >
In addition, the process for producing the purified sludge powder may be heat-treated at 400 to 800, and the calcining process may be performed at a temperature of 800 to 1000 for 1 minute to 48 hours.
INDUSTRIAL APPLICABILITY The present invention is capable of absorbing and releasing moisture and capable of absorbing harmful substances such as volatile organic compounds (VOC) and formaldehyde.
In addition, since the present invention utilizes purified water sludge, which is generated in the treatment process of a water treatment plant for making tap water, it is possible to recycle resources, and flame retardancy which does not burn well is made of an inorganic raw material, It is low in mass production and is made of inorganic material harmless to the human body and has excellent characteristics of absorbing and releasing harmful substances.
In the present invention, the humidity control function refers to a function of controlling the humidity. When the humidity is high, the moisture is sucked and when the humidity is low, the moisture is blown out. In the present invention, when the environmental humidity is raised by the capillary It has the function of condensing and absorbing water vapor, evaporating condensed water when the humidity is low, and maintaining a certain range of humidity in response to changes in the external environment in the inside of the building or in the living space.
1 is a graph showing the moisture absorption and desorption history curve
2 is a photograph showing the purified sludge concentration tank used in a water purification plant
3 is a photograph showing the water sludge is removed from the water by using a belt press in a water treatment plant to form a cake
FIG. 4 is a graph showing a photograph of the purified sludge after heat treatment according to an embodiment of the present invention
5 is a flowchart showing a method of manufacturing a porous composition using purified water sludge according to an embodiment of the present invention
FIG. 6 is a photograph showing a composition prepared in the form of balls using purified water sludge according to an embodiment of the present invention
FIGS. 7A and 8B are photographs of specimens of a composition prepared in the form of balls using purified water sludge according to an embodiment of the present invention by a scanning electron microscope (SEM)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
1 is a graph showing a moisture absorption and desorption history curve.
In FIG. 1, 'adsorption' indicates moisture absorption and 'desorption' indicates moisture vaporization (evaporation of moisture).
Referring to FIG. 1, the hygroscopic function occurs at a lower humidity as the pore diameter is smaller. The pore of about 10 is condensed at a relative humidity (RH) of 90%, and the moisture is evaporated (moisture) The evaporation at about 10 pores occurs at a lower relative humidity (RH) of 80% than condensation.
This phenomenon is explained by the moisture absorption and hysteresis curve, and the humidity of the moisture absorptive and desorbing standard depends on the pore size and the amount thereof increases with the porosity. Therefore, it is known that the larger the pore size, the higher the humidity is. In general, it is known that the moisture absorption and desorption occurs at a pore range of about 3 to 7.5 when the average humidity is 40 to 70%.
Such moisture absorptive and desorptive properties are divided into short-term and long-term types depending on the time of expression. Short-term types are those that absorb and desorb about 80% or more within 12 hours. Wood-based materials and so on. Depending on the material, it may also have a composite property of long or short type.
FIG. 2 is a photograph showing a purified water sludge concentration tank used in a water purification plant, and FIG. 3 is a photograph showing that water is removed from a purified water sludge by using a belt press in a water purification plant to form a cake.
Referring to FIG. 2 and FIG. 3, most of the purified water sludge is generated in the sedimentation process in the process of making tap water. The drainage sludge is discharged from the sedimentation basin, the drainage sludge is concentrated through the primary concentration tank and the secondary concentration tank, and then an excessive amount of water is removed by using a belt press or the like and discharged in the form of a cake. As of 2010, the amount of sludge obtained in the form of cakes is 500,000 tons per year.
4 is a photograph of a purified sludge according to an embodiment of the present invention after heat treatment.
Referring to FIG. 4, the purified sludge is preferably used after heat treatment at a temperature of 400 to 800, preferably 600. The organic matter contained in the purified sludge is burned and removed by the heat treatment, and purified sludge powder can be obtained.
The purified sludge powder comprises 40 to 60 wt% of SiO 2 , 25 to 45 wt% of Al 2 O 3 , 2 to 10 wt% of Fe 2 O 3 , 0.1 to 3 wt% of CaO, 0.1 to 5 wt% of MgO, K 2 O 0.1 to 6% by weight, Na 2 O 0.01 to 2 wt%, TiO 2 0.01 to 2 wt%, P 2 O 5 0.01 to 3 wt%, MnO 0.01 to 2% by weight, ZrO 2, 0.001 to 1% by weight 0.001 to 1% Cr 2 O 3, 0.001 to 1% SrO, 0.001 to 1% Li 2 O, 0.001 to 1% BaO and 0.001 to 1% PbO.
Analysis of the purified sludge powder formed by heat treatment of the purified sludge at 600 to 10 minutes showed that the silica (SiO 2 ) contained about 48 to 50 wt% and the aluniima (Al 2 O 3 ) contained about 34 to 37 wt% And enables the formation of a porous body for the humidity control function.
Table 1 below shows the analysis of the chemical composition after heat treatment of the purified sludge generated in the water treatment plant at 600 for 10 minutes.
The porous composition according to a preferred embodiment of the present invention is composed of purified sludge powder formed by heat treatment of purified water sludge at 400 to 800 generated in a water treatment plant making tap water, waste glass powder 70 to 130 10 to 40 parts by weight of at least one material selected from silica powder and zeolite powder, and 70 to 130 parts by weight of clay based on 100 parts by weight of purified water sludge powder, based on 100 parts by weight of purified water sludge powder.
It is preferable that the waste glass powder is composed of pulverized waste glass powder which is pulverized to be less than 50 to 800 mesh with less strength and weak plasticity when the waste glass powder is less loaded.
The silica powder and the zeolite powder are preferably composed of a powder having an average particle diameter of 1 to 80. The silica powder may be a porous material and may serve as a humidity control performance agent. In the case of zeolite, can do.
The clay can be bentonite, and the bentonite facilitates the molding with the plastic raw material, and if the content of bentonite is too small, the molding may not be performed well, and if too much, the cost is high.
The porous composition of the present invention may further comprise 10 to 40 parts by weight of TiO 2 based on 100 parts by weight of the purified water sludge powder, and TiO 2 may play a role of rendering the color of the porous moisture-proof board white.
Also, the porous composition of the present invention may further comprise 0.1 to 40 parts by weight of at least one material selected from the group consisting of diatomaceous earth, gypsum, alophene, imoglitol, slaked lime, dolomite and charcoal based on 100 parts by weight of the purified water sludge powder. , Gypsum, allophene, imoglitol, slaked lime, dolomite and char can be used as a humidity control performance agent.
Hereinafter, a method of preparing a porous composition capable of exhibiting moisture absorptive and desorptive properties through nano pores after dewatering and heat treatment of floating sludge as a suspended precipitate having nanoparticles, followed by a low-temperature firing process using an appropriate mixture, will be described.
5 is a flowchart showing a method of manufacturing a porous composition using purified water sludge according to an embodiment of the present invention.
Referring to FIG. 5, purified water sludge generated in the treatment process of tap water is prepared, and purified sludge is heat treated at 400 to 800, preferably 600 to form purified water sludge powder (500).
100 kg of purified sludge powder of 200 mesh to 325 mesh is put into a seeding machine (not shown), and 30 liters of water is slowly sprayed to produce granules having a size of 0.1 mm. Then, water and purified water sludge are alternately fed to a seed molding machine (510) when the granules have a size of 1 mm or more.
10 to 40 parts by weight of at least one material selected from silica powder and zeolite powder per 100 parts by weight of purified water sludge powder, 100 to 40 parts by weight of purified water sludge powder per 100 parts by weight of purified water sludge powder, 70 to 130 parts by weight of clay are mixed to produce a mixture (520).
At this time, 10 to 40 parts by weight of TiO 2 may be further mixed with 100 parts by weight of purified water sludge powder. 1 part selected from diatomaceous earth, gypsum, alophene, immiglot, slaked lime, dolomite and char is mixed with 100 parts by weight of purified water sludge powder. 0.1 to 40 parts by weight of the above-mentioned materials may be further mixed.
The waste glass powder is preferably pulverized waste glass powder smaller than 50 to 800 mesh in consideration of the porosity characteristics of the porous moisture-proof board and the like. One or more materials selected from the silica powder and the zeolite powder are preferably used as the porous moisture- It is preferable to use a powder having an average particle diameter of 1 to 80, preferably 20 to 50, in consideration of porosity characteristics and the like. The clay may be bentonite.
Mixing can be done in a variety of ways, and here an example using a wet ball milling process is described.
In the ball milling process, the starting material is charged into a ball milling machine and wet-mixed with a solvent such as distilled water. The starting material is pulverized while mechanically mixing by rotating it at a constant speed using a ball milling machine. The ball used for ball milling is preferably a ceramic ball such as alumina in order to suppress the generation of impurities, and the balls may be all the same size or may be used together with balls having two or more sizes. The size of the ball, the milling time, and the rotation speed per minute of the ball miller. For example, the size of the balls may be set in the range of about 1 to 50, and the rotational speed of the ball miller may be set in the range of about 50 to 500 rpm. The ball milling is preferably performed for 1 to 48 hours, and by ball milling, the starting material is mixed and pulverized into finer-size particles and has a uniform particle size distribution. By such a wet mixing process, the material is undifferentiated to form a slurry state, and such a slurry material can be used as the porous composition.
The dried water sludge particles and the resulting mixture are introduced into a ball molding machine (not shown) to form a ball-shaped composition to produce a ball-shaped porous composition (530), followed by drying the shaped porous composition. At this time, other shapes such as a hexahedron, a three-sided body, etc. may be formed in addition to the ball shape.
The dried porous composition is charged into a furnace (not shown) such as an electric furnace and subjected to a firing process (540). The firing process is a process for achieving mechanical strength or other necessary properties, and it is possible to adjust the amount of the composition to be fed into the furnace by predetermining the amount of the composition to be dried for efficient firing.
The firing process is preferably performed at a temperature of about 800 to 1000, which is relatively low, for about 1 minute to 48 hours, and the pressure inside the furnace is preferably kept constant during firing. If the firing temperature is less than 800, the composition for the porous humidity-conditioning board may be incompletely fired and the characteristics of the porous humidity-resistance board may not be good. If the firing temperature is more than 1000, the energy consumption may be uneconomical.
The firing temperature is preferably raised at a rate of 1 to 50 / min. If the rate of temperature rise is too slow, the time is long and the productivity is deteriorated. If the rate of temperature rise is too high, thermal stress may be applied due to a rapid temperature rise It is preferable to raise the temperature at the temperature raising rate within the above-mentioned range.
If the firing time is too long, energy consumption is high, so it is not only economical but also it is difficult to expect a further firing effect. When the firing time is too small, Incomplete firing can be achieved.
The firing is preferably performed in an oxidizing atmosphere (for example, air or oxygen (O 2 ) atmosphere).
After the firing process is performed, the furnace temperature is lowered to unload the porous composition. The furnace cooling may be effected by shutting down the furnace power source to cool it in a natural state, or optionally by setting a temperature lowering rate (for example, 10 / min). It is preferable to keep the pressure inside the furnace constant even while the furnace temperature is lowered.
On the other hand, it is possible to further include a step of applying a glaze to the surface of the ball-like composition dried before the firing step. The glaze may be applied to the dried ball-shaped composition by a silk screen, spraying method or the like. At this time, the glaze that can be used is not particularly limited. Examples of glazes which can be used include pulverizing borosilicate frit having a melting point lower than the firing temperature to a predetermined size (for example, 200 mesh) and adding a predetermined amount of material such as kaolin (for example, 5 wt% And can be used as a glaze. It is preferable that the surface area of the glaze is in the range of 30 to 95% with respect to the molded product. If the surface area exceeds 95%, the humidity control performance is limited. If the surface area is less than 30% The probability of accumulation increases.
FIG. 6 is a photograph showing a composition prepared in the form of balls using purified water sludge manufactured by the method as described above.
7A and 8B are photographs of a specimen of a ball-shaped composition using purified water sludge according to an embodiment of the present invention by a scanning electron microscope (SEM).
Referring to FIGS. 7A and 8B, it can be seen that pores exist in a ball-shaped composition using the purified water sludge of the present invention.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.
Claims (5)
Mixing the purified water sludge powder with water to form granules of a predetermined size;
10 to 40 parts by weight of at least one material selected from silica powder and zeolite powder per 100 parts by weight of the purified sludge powder, 100 to 30 parts by weight of the purified sludge powder, Mixing 70 to 130 parts by weight of clay with respect to the mixture to form a mixture;
Forming a predetermined type of composition using the granules and the mixture;
And calcining the composition of the predetermined type.
Wherein the predetermined type of composition is a ball-shaped composition.
Further comprising the step of applying a glaze to the composition of the predetermined type before the firing process,
Wherein the specific surface area of the composition is 30 to 95%.
Wherein the process for producing the purified sludge powder is heat-treated at 400 to 800.
Wherein the calcining is performed at a temperature of 800 to 1000 for 1 minute to 48 hours.
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| KR1020140075911A KR20150145614A (en) | 2014-06-20 | 2014-06-20 | Composite using water treatment sludge and manufacturing method thereof |
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| KR1020140075911A KR20150145614A (en) | 2014-06-20 | 2014-06-20 | Composite using water treatment sludge and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI687388B (en) * | 2019-04-09 | 2020-03-11 | 國立中興大學 | Clean water sludge reproduction-based light-weight pellet material, preparation method and manufacturing system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI687388B (en) * | 2019-04-09 | 2020-03-11 | 國立中興大學 | Clean water sludge reproduction-based light-weight pellet material, preparation method and manufacturing system thereof |
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